Historical on-time performance
Buffalo to Chicago
473 miData through May 2026Source: US DOT · BTS
Flights on BUF–ORD arrive on time 72% of the time over the last 12 months.
On-time rate72%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled2.8%of scheduled flights
based on 1,848 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesbestOn-time82%Medianon timep9030 minCancel2.3%Flights427
- United AirlinesOn-time73%Medianon timep9050 minCancel1.2%Flights565
- Republic AirwaysOn-time71%Medianon timep9070 minCancel3.9%Flights256
- Envoy AirOn-time69%Medianon timep9060 minCancel3.1%Flights449
- SkyWest AirlinesOn-time50%Median10 minp90175 minCancel7.3%Flights151
Why flights run late
Delay causes
- Airline33%
- Weather5%
- Air traffic (NAS)32%
- Late aircraft30%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline13%
- Weather52%
- Air traffic (NAS)35%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 52 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly BUF → ORD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 58% to 82% on time.
- Mornings82% on time · p90 30 min · 2,256 flights
- Middays82% on time · p90 40 min · 1,467 flights
- Afternoons75% on time · p90 55 min · 642 flights
- Evenings58% on time · p90 70 min · 1,563 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 76% on time.
- Mondays76% on time · p90 45 min · 868 flights
- Fridays76% on time · p90 45 min · 883 flights
- Thursdays75% on time · p90 45 min · 884 flights
- Wednesdays75% on time · p90 50 min · 843 flights
- Saturdays75% on time · p90 45 min · 760 flights
- Tuesdays75% on time · p90 50 min · 835 flights
- Sundays73% on time · p90 65 min · 861 flights
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